Ecoboost spark plug interval

[buck91]

Living in the rust belt I, too, am a fan of anti seize. Yes, I use it on my spark plugs but just a very small amount and I am very careful about torquing them.

 

[cb_13]

60k

 

[Whimsey]

Changed the plugs in our 2017 2.3EB Explorer at 60,000 mi. Not for performance issues but I didn't want them causing problems removing them later. These were the factory plugs and they were squeaky and 2 of them put up a bit of resistance in removing them. I used replacement Motorcraft plugs and I did use anti seize sparingly on the threads and used a torque wrench when installing them. I reduced the torque value by 15% to account for the anti seize. From a performance standpoint the "old" plugs were in great shape, the gaps were all well withing the gap spec range. If I was going to get rid of the vehicle by the 100,000 mile plug change interval I would have left them alone. But we keep out vehicles for a LONG time .

 

[Jason2007]

I just replaced the factory iridium plugs in my 2014 Taurus SHO w/73k. Installed Motorcraft replacements and gained an honest 1.5mpg and better idle.

 

[nthach]

The only place where I'd use anti seize with modern-ish plugs is on the portion below the tapered seat on those awful Ford 3v modular engine plugs.

I believe Honda also calls for a teeny bit of antiseize on their plugs as well. But dealer techs usually install them naked, no “dressing”.

 

[ctechbob]

I believe Honda also calls for a teeny bit of antiseize on their plugs as well. But dealer techs usually install them naked, no “dressing”.

I used to be an advocate of AS on plugs until the last set I did on my Accord. I had a few of them come out hard. Hard to the point there was real fear that they were going to break off in the head. So I don't use any on the J-Series motors now. The Ranger will probably get plugs at 30K since it seems that motor is a little harder on plugs than normal and it is about to be worked hard pulling a travel trailer.

 

[irekm]

3.5 ecoboost ( tuned for at least 110k) 120k miles on the motor, new NGK iridium plugs every 30k, always a bit of AS.
Tuned motor, eats away plugs pretty bad.
I Gap them at. 028, last set came out. 040

 

[buck91]

Perhaps I should start a new thread but is anybody familiar with the changes to the OE plug replacements? Looks like sp542 has been superceeddd by sp578 those those are a hotter plug? And M-12405-35T is actually the colder direct replacement? And what the heck would be the preferred option on a stock motor?

 

[ctechbob]

Perhaps I should start a new thread but is anybody familiar with the changes to the OE plug replacements? Looks like sp542 has been superceeddd by sp578 those those are a hotter plug? And M-12405-35T is actually the colder direct replacement? And what the heck would be the preferred option on a stock motor?

I'd be interested in that as well. Ford changed it on the 2.3 EB as well from 2019 to 2020. I suppose I should start looking into that since I'm about 5k away from the plugs, so I'll be doing those sometime later this year. With supply shortages and the like I should probably go ahead and have the new ones on hand.

 

[MNgopher]

They did change the OE plug. I used the new replacement, and again could not feel any difference and noted no change in fuel mileage, etc...